DFT30 is an original Rockstar GTA-San Andreas Truck, but it had a bug.
A tire was missing, because Rockstar gave the wrong name to a dummy
How to Install
You need IMG Tool 2.0 for installing this fix of DFT30
Run IMG Tool 2.0 and open your gta3.img in game dir/models
Now search for dft30 (Edit/Find) and delete dft30.dff
now go on Commands/Add and add the dft30.dff out of this archive.
close IMG Tool 2.0, run the game, go into the docks or to the countryside in LV
to find the DFT30 with 6 wheels instead of 5 and a licence plate at front.